We tried to go Orca watching in a big speedboat thing, but the water was too rough that day so they cancelled - but you can rent speedboats surprisingly cheaply and spend a day darting between oil tankers, landing boat planes and floating fuel stations.

Even if you don't have kids, that fly over canada thing is pretty cool too and worth 30 minutes of your time, I went for the first time a few weeks ago. Was blown away by how good it is. edit: i expected it to be complete shit, so my expectations were low.

If you have two days, I wouldn't waste it on a trip to the island. plenty to keep you occupied for two days.